[Haskell-cafe] Fwd: hackage compile failure with QuickCheck 2.5

Ross Paterson ross at soi.city.ac.uk
Tue Jul 17 19:26:52 CEST 2012

With ghc 7.4.1, cabal-install 0.13.3 and Cabal 1.14.0,

% cabal install --avoid-reinstalls sbv-2.2

fails to find a plan without reinstalls, and recommends --solver=modular.

% cabal install --solver=modular --avoid-reinstalls sbv-2.2

reinstalls template-haskell-, which breaks the GHC installation.

I've added the suggested --constraint='template-haskell=='
option as a workaround, but it seems the --avoid-reinstalls option is
being ignored.

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